13232 + Interview Questions in Physics Page 156 InterviewSolution

7751.	An alloy of copper and zinc weighs 320 g in waterand 302 g in a liquid of density 1.4 g cm-3. If the density of copper is 8.9 g cm and that of the zinc is74 g cm"3, find the measure of the masses of copper and zinc in the alloy
Answer» An alloy of copper and zinc weighs 320 g in waterand 302 g in a liquid of density 1.4 g cm-3. If the density of copper is 8.9 g cm and that of the zinc is74 g cm"3, find the measure of the masses of copper and zinc in the alloy

Discussion

7752.	20.If an object is falled freely from a tower and it travels 55 m in the last second .what is the height of the tower
Answer» 20.If an object is falled freely from a tower and it travels 55 m in the last second .what is the height of the tower

Discussion

7753.	Which of the following blocks will move rightward?
Answer» Which of the following blocks will move rightward?

Discussion

7754.	How to find moment of inertia of a triangle about its centre of mass
Answer» How to find moment of inertia of a triangle about its centre of mass

Discussion

7755.	63.In a car race. Cara A takes5sec less than car B and passes the end point of race with velocity v more than the velocity with which car B passes the point if acceleration of car Aand B are 9m/s2 and 4m/s2 then the time in which carb complete the race
Answer» 63.In a car race. Cara A takes5sec less than car B and passes the end point of race with velocity v more than the velocity with which car B passes the point if acceleration of car Aand B are 9m/s2 and 4m/s2 then the time in which carb complete the race

Discussion

7756.	On which of the following factors does the kinetic energy of a body depend?
Answer» On which of the following factors does the kinetic energy of a body depend?

Discussion

7757.	50 kJ of energy causes a displacement of 25 m in a body in the direction of force in 2.5 s. Find the power.
Answer» $50 kJ$ of energy causes a displacement of $25 m$ in a body in the direction of force in $2.5 s$ . Find the power.

Discussion

7758.	the partial pressure of H2 in a flask containing 2 gram H2 and 16 gram O2 is a.1/8 of the total pressure b.1/2 of the total pressure c.1/4 of the total pressure d.2/3 of the total pressur
Answer» the partial pressure of H2 in a flask containing 2 gram H2 and 16 gram O2 is a.1/8 of the total pressure b.1/2 of the total pressure c.1/4 of the total pressure d.2/3 of the total pressur

Discussion

7759.	Question 2We can see a non-luminous object when the light(a) emitted by the object falls on the eye(b) is reflected from the object towards our eye(c) completely passes through the object(d) gets completely absorbed by the object
Answer» Question 2 We can see a non-luminous object when the light (a) emitted by the object falls on the eye (b) is reflected from the object towards our eye (c) completely passes through the object (d) gets completely absorbed by the object

7759.

Question 2We can see a non-luminous object when the light(a) emitted by the object falls on the eye(b) is reflected from the object towards our eye(c) completely passes through the object(d) gets completely absorbed by the object

Answer»

Question 2

We can see a non-luminous object when the light

(a) emitted by the object falls on the eye

(b) is reflected from the object towards our eye

(c) completely passes through the object

(d) gets completely absorbed by the object

Discussion

7760.	Question 13A ball is thrown vertically upwards with a velocity of 49 m/s. Calculate(i) the maximum height to which it rises.(ii) the total time it takes to return to the surface of the earth.
Answer» Question 13 A ball is thrown vertically upwards with a velocity of 49 m/s. Calculate (i) the maximum height to which it rises. (ii) the total time it takes to return to the surface of the earth.

Discussion

7761.	Why does a man weigh less on the moon than on the Earth?
Answer» Why does a man weigh less on the moon than on the Earth?

Discussion

7762.	If a body of mass 3 kg is dropped from the top of a tower of height 250 m, then its kinetic energy after 3 s will be
Answer» If a body of mass 3 kg is dropped from the top of a tower of height 250 m, then its kinetic energy after 3 s will be

Discussion

7763.	In a plane mirror, an object is placed 0.50 m in front of the mirror. The distance between the object and its image is ________.
Answer» In a plane mirror, an object is placed $0.50 m$ in front of the mirror. The distance between the object and its image is ________.

Discussion

7764.	An object is projected upwards with a velocity of 4.9m/s. It will strike the ground approx?
Answer» An object is projected upwards with a velocity of 4.9m/s. It will strike the ground approx?

Discussion

7765.	An object thrown vertically up from the ground passes the height 5m twice in an interval of 10 second . What is its time of flight?
Answer» An object thrown vertically up from the ground passes the height 5m twice in an interval of 10 second . What is its time of flight?

Discussion

7766.	why aluminum cation has smaller size than magnesium cation.
Answer» why aluminum cation has smaller size than magnesium cation.

Discussion

7767.	Why should we not put a pin or pencil in our ears ?
Answer» Why should we not put a pin or pencil in our ears ?

Discussion

7768.	What is meant by the efficient use of energy ?
Answer» What is meant by the efficient use of energy ?

Discussion

7769.	Virtual images
Answer» Virtual images

Discussion

7770.	Which of the following represents electrical power dissipated in an electrical circuit?
Answer» Which of the following represents electrical power dissipated in an electrical circuit?

Discussion

7771.	What is the difference between Horseshoe magnet and U shaped magnet .........????? Answer with diagram is needed.
Answer» What is the difference between Horseshoe magnet and U shaped magnet .........????? Answer with diagram is needed.

Discussion

7772.	Why is the solar cooker painted black from inside?
Answer» Why is the solar cooker painted black from inside?

Discussion

7773.	From an elevated point A a stone is projected verticalyy upwards. When the stone reaches a distance h below A its velocity is double of what it was at a height above A. The greatest height attained by the stone is nh/3. What is the value of n?
Answer» From an elevated point A a stone is projected verticalyy upwards. When the stone reaches a distance h below A its velocity is double of what it was at a height above A. The greatest height attained by the stone is nh/3. What is the value of n?

Discussion

7774.	Battery shown in figure has emf E and internal resistance r. Current in the circuit can be varied by sliding the contact J.If at any instant, current flowing through the circuit is i, potential difference between the terminals of the cell is V, thermal power generated in the external circuit is P and the fraction of thermal power generated in the cell to the total electrical power generated in the circuit is equal to η, then which of the following graphs is/are correct ?
Answer» Battery shown in figure has emf $E$ and internal resistance $r$ . Current in the circuit can be varied by sliding the contact $J$ . If at any instant, current flowing through the circuit is $i$ , potential difference between the terminals of the cell is $V$ , thermal power generated in the external circuit is $P$ and the fraction of thermal power generated in the cell to the total electrical power generated in the circuit is equal to $η$ , then which of the following graphs is/are correct ?

Discussion

7775.	A train travels 40 km at a uniform speed of 30kmh−1. Its average speed after travelling another 40 km is 45kmh−1 for the whole journey. Its speed in the second half of the journey is
Answer» A train travels 40 km at a uniform speed of $30 k m h^{- 1}$ . Its average speed after travelling another 40 km is $45 k m h^{- 1}$ for the whole journey. Its speed in the second half of the journey is

Discussion

7776.	Name the physical quantity whose unit is watt.
Answer» Name the physical quantity whose unit is watt.

Discussion

7777.	A man can throw a stone to a maximum height H.The greatedt horizontal dis†an ce upto which he can throw the stone is 1) h 2) 2h 3)4
Answer» A man can throw a stone to a maximum height H.The greatedt horizontal dis†an ce upto which he can throw the stone is 1) h 2) 2h 3)4

Discussion

7778.	Question 15 An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed so that a sharp focused image can be obtained? Find the size and the nature of the image.
Answer» Question 15 An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed so that a sharp focused image can be obtained? Find the size and the nature of the image.

Discussion

7779.	If something is submerged in water, it will displace an amount of water equal to its volume. If something is floating in water, it will displace an amount of water equal to its weight. wHAT IS THE DIFFERENCE BETWEEN THESE TWO POINTS??
Answer» If something is submerged in water, it will displace an amount of water equal to its volume. If something is floating in water, it will displace an amount of water equal to its weight. wHAT IS THE DIFFERENCE BETWEEN THESE TWO POINTS??

Discussion

7780.	If F1 is the magnitude of the force exerted on the Sun by Earth and F2 is the magnitude of the force exerted on Earth by the Sun, then :
Answer» If $F_{1}$ is the magnitude of the force exerted on the Sun by Earth and $F_{2}$ is the magnitude of the force exerted on Earth by the Sun, then :

Discussion

7781.	A girl starts from point A goes to O then to B. She then returns to A following a circular track. What is the distance covered and displacement of the girl?Given: OA = OB = 15 m and length of circular track AB = 80 m.
Answer» A girl starts from point A goes to O then to B. She then returns to A following a circular track. What is the distance covered and displacement of the girl? Given: OA = OB = $15 m$ and length of circular track AB = $80 m .$

Discussion

7782.	82.Which one of the pair cannot be the rectangular component of force vector of 10N? (a) 6N & 8N (b) 7N & \sqrt{51} (c) 6 \sqrt{ 2} & 2 7 (d) 9N & 1N
Answer» 82.Which one of the pair cannot be the rectangular component of force vector of 10N? (a) 6N & 8N (b) 7N & \sqrt{51} (c) 6 \sqrt{ 2} & 2 7 (d) 9N & 1N

Discussion

7783.	If 4.5kg of fuel is completely burnt and the amount of heat produced stands measured at 1,80,000 KJ what is the calorific value?
Answer» If 4.5kg of fuel is completely burnt and the amount of heat produced stands measured at 1,80,000 KJ what is the calorific value?

Discussion

7784.	A satellite is launched into an orbit around the Earth. It has a critical velocity of about 6 km s−1. What is the height of the satellite in km? (G=6.67×10−11 Nm2 kg−2, M=6×1024 kg, and R=6,370 km)
Answer» A satellite is launched into an orbit around the Earth. It has a critical velocity of about $6 {km s}^{- 1}$ . What is the height of the satellite in $km$ ? ( $G = 6.67 \times 10^{- 11} {Nm}^{2} {kg}^{- 2}$ , $M = 6 \times 10^{24} kg$ , and $R = 6, 370 km$ )

Discussion

7785.	Question 3(c)State whether the following statement is true or false.Lightning conductor cannot protect a building from lightning.
Answer» Question 3(c) State whether the following statement is true or false. Lightning conductor cannot protect a building from lightning.

7785.

Question 3(c)State whether the following statement is true or false.Lightning conductor cannot protect a building from lightning.

Answer»

Question 3(c)

State whether the following statement is true or false.

Lightning conductor cannot protect a building from lightning.

Discussion

7786.	Calculate the gravitation force between a object of mass 80 kg and a object of mass 1200 kg kept at a distance of 10 m.
Answer» Calculate the gravitation force between a object of mass 80 kg and a object of mass 1200 kg kept at a distance of 10 m.

Discussion

7787.	A cricket ball of mass 200 g moving with a speed of 40 m s−1is brought to rest by a player in 0.04 s. Calculate the following :(i) change in momentum of the ball,(ii) average force applied by the player. [2 MARKS]
Answer» A cricket ball of mass $200 g$ moving with a speed of $40 m s^{- 1}$ is brought to rest by a player in $0.04 s$ . Calculate the following : (i) change in momentum of the ball, (ii) average force applied by the player. [2 MARKS]

Discussion

7788.	If a tennis ball of mass 50 g is moving with a velocity of 0.2 m s–1 is stopped by player in 0.8 s, what is the force applied by the player to stop the ball ?
Answer» If a tennis ball of mass 50 g is moving with a velocity of 0.2 m s^–1 is stopped by player in 0.8 s, what is the force applied by the player to stop the ball ?

Discussion

7789.	For a displacement-time graph given below, what is the required nature of acceleration-time graph?
Answer» For a displacement-time graph given below, what is the required nature of acceleration-time graph?

Discussion

7790.	Question 70(ii)A man started his journey on his car from Location A and came back. The given graph shows his position at different times during the whole journey.What was the total duration of the journey?
Answer» Question 70(ii) A man started his journey on his car from Location A and came back. The given graph shows his position at different times during the whole journey. What was the total duration of the journey?

Discussion

7791.	Two sounds having the same speed in a medium are having wavelengths 1.3 m and 3.9 m. A person listens to these sounds. What is the difference between the two sounds the person hears?
Answer» Two sounds having the same speed in a medium are having wavelengths 1.3 m and 3.9 m. A person listens to these sounds. What is the difference between the two sounds the person hears?

Discussion

7792.	12 identical resistance of resistance R each are arranged in form of a cube. Resistance across it's one of the face diagonal is?
Answer» 12 identical resistance of resistance R each are arranged in form of a cube. Resistance across it's one of the face diagonal is?

Discussion

7793.	55.Rain is falling vertically with a velocity of 3km/h.A man walks in the rain with velocity of 4km/h.The drops will fall on the man with a velocity of
Answer» 55.Rain is falling vertically with a velocity of 3km/h.A man walks in the rain with velocity of 4km/h.The drops will fall on the man with a velocity of

Discussion

7794.	Why is it advised to tie a luggage on the roof of a bus with a rope?
Answer» Why is it advised to tie a luggage on the roof of a bus with a rope?

Discussion

7795.	A pressure sensor measures 44 psi just before the sudden change of 70 psi. The sensor measures 52 psi at a time 4.5 sec after the change. The sensor time constant (in sec) is 37
Answer» A pressure sensor measures 44 psi just before the sudden change of 70 psi. The sensor measures 52 psi at a time 4.5 sec after the change. The sensor time constant (in sec) is 37

Discussion

7796.	As per the request of one of his friends from equator, Rahul buys 100 grams of silver at the north pole. He hands it over to his friend at the equator. Will the friend agree with the weight of silver bought? If not, why?
Answer» As per the request of one of his friends from equator, Rahul buys 100 grams of silver at the north pole. He hands it over to his friend at the equator. Will the friend agree with the weight of silver bought? If not, why?

Discussion

7797.	A bunch of feathers and a stone of the same mass are released simultaneously in air. Which will fall faster and why ? How will your observation be different if they are released simultaneously in vacuum ?
Answer» A bunch of feathers and a stone of the same mass are released simultaneously in air. Which will fall faster and why ? How will your observation be different if they are released simultaneously in vacuum ?

Discussion

7798.	As shown in the figure, an object O is at the position (−10,2) with respect to the origin P. The concave mirror M1 has radius of curvature 30 cm. A plane mirror M2 is kept at a distance of 40 cm in front of the concave mirror. Consider first reflection on the concave mirror M1 and second on the plane mirror M2. Find the coordinates of the second image w.r.t the origin P.
Answer» As shown in the figure, an object O is at the position ( $- 10, 2$ ) with respect to the origin P. The concave mirror $M_{1}$ has radius of curvature $30 cm$ . A plane mirror $M_{2}$ is kept at a distance of $40 cm$ in front of the concave mirror. Consider first reflection on the concave mirror $M_{1}$ and second on the plane mirror $M_{2}$ . Find the coordinates of the second image w.r.t the origin P.

Discussion

7799.	Choose the ray diagram which shows the image formation for object placed at center of curvature of concave mirror.
Answer» Choose the ray diagram which shows the image formation for object placed at center of curvature of concave mirror.

7799.

Choose the ray diagram which shows the image formation for object placed at center of curvature of concave mirror.

Answer»

Choose the ray diagram which shows the image formation for object placed at center of curvature of concave mirror.

Discussion

7800.	The mass of water displaced by a solid of mass 400 g and volume 150 cm3 is
Answer» The mass of water displaced by a solid of mass 400 g and volume 150 $c m^{3}$ is

Discussion

Explore topic-wise InterviewSolutions in .

An alloy of copper and zinc weighs 320 g in waterand 302 g in a liquid of density 1.4 g cm-3. If the density of copper is 8.9 g cm and that of the zinc is74 g cm"3, find the measure of the masses of copper and zinc in the alloy

20.If an object is falled freely from a tower and it travels 55 m in the last second .what is the height of the tower

Which of the following blocks will move rightward?

How to find moment of inertia of a triangle about its centre of mass

63.In a car race. Cara A takes5sec less than car B and passes the end point of race with velocity v more than the velocity with which car B passes the point if acceleration of car Aand B are 9m/s2 and 4m/s2 then the time in which carb complete the race

On which of the following factors does the kinetic energy of a body depend?

50 kJ of energy causes a displacement of 25 m in a body in the direction of force in 2.5 s. Find the power.

the partial pressure of H2 in a flask containing 2 gram H2 and 16 gram O2 is a.1/8 of the total pressure b.1/2 of the total pressure c.1/4 of the total pressure d.2/3 of the total pressur

Question 2We can see a non-luminous object when the light(a) emitted by the object falls on the eye(b) is reflected from the object towards our eye(c) completely passes through the object(d) gets completely absorbed by the object

Question 13A ball is thrown vertically upwards with a velocity of 49 m/s. Calculate(i) the maximum height to which it rises.(ii) the total time it takes to return to the surface of the earth.

Why does a man weigh less on the moon than on the Earth?

If a body of mass 3 kg is dropped from the top of a tower of height 250 m, then its kinetic energy after 3 s will be

In a plane mirror, an object is placed 0.50 m in front of the mirror. The distance between the object and its image is ________.

An object is projected upwards with a velocity of 4.9m/s. It will strike the ground approx?

An object thrown vertically up from the ground passes the height 5m twice in an interval of 10 second . What is its time of flight?

why aluminum cation has smaller size than magnesium cation.

Why should we not put a pin or pencil in our ears ?

What is meant by the efficient use of energy ?

Virtual images

Which of the following represents electrical power dissipated in an electrical circuit?

What is the difference between Horseshoe magnet and U shaped magnet .........????? Answer with diagram is needed.

Why is the solar cooker painted black from inside?

From an elevated point A a stone is projected verticalyy upwards. When the stone reaches a distance h below A its velocity is double of what it was at a height above A. The greatest height attained by the stone is nh/3. What is the value of n?

A train travels 40 km at a uniform speed of 30kmh−1. Its average speed after travelling another 40 km is 45kmh−1 for the whole journey. Its speed in the second half of the journey is

Name the physical quantity whose unit is watt.

A man can throw a stone to a maximum height H.The greatedt horizontal dis†an ce upto which he can throw the stone is 1) h 2) 2h 3)4

Question 15 An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed so that a sharp focused image can be obtained? Find the size and the nature of the image.

If something is submerged in water, it will displace an amount of water equal to its volume. If something is floating in water, it will displace an amount of water equal to its weight. wHAT IS THE DIFFERENCE BETWEEN THESE TWO POINTS??

If F1 is the magnitude of the force exerted on the Sun by Earth and F2 is the magnitude of the force exerted on Earth by the Sun, then :

A girl starts from point A goes to O then to B. She then returns to A following a circular track. What is the distance covered and displacement of the girl?Given: OA = OB = 15 m and length of circular track AB = 80 m.

82.Which one of the pair cannot be the rectangular component of force vector of 10N? (a) 6N & 8N (b) 7N & \sqrt{51} (c) 6 \sqrt{ 2} & 2 7 (d) 9N & 1N

If 4.5kg of fuel is completely burnt and the amount of heat produced stands measured at 1,80,000 KJ what is the calorific value?

A satellite is launched into an orbit around the Earth. It has a critical velocity of about 6 km s−1. What is the height of the satellite in km? (G=6.67×10−11 Nm2 kg−2, M=6×1024 kg, and R=6,370 km)

Question 3(c)State whether the following statement is true or false.​​​​​​​Lightning conductor cannot protect a building from lightning.

Calculate the gravitation force between a object of mass 80 kg and a object of mass 1200 kg kept at a distance of 10 m.

A cricket ball of mass 200 g moving with a speed of 40 m s−1is brought to rest by a player in 0.04 s. Calculate the following :(i) change in momentum of the ball,(ii) average force applied by the player. [2 MARKS]

If a tennis ball of mass 50 g is moving with a velocity of 0.2 m s–1 is stopped by player in 0.8 s, what is the force applied by the player to stop the ball ?

For a displacement-time graph given below, what is the required nature of acceleration-time graph?

Question 70(ii)A man started his journey on his car from Location A and came back. The given graph shows his position at different times during the whole journey.What was the total duration of the journey?

Two sounds having the same speed in a medium are having wavelengths 1.3 m and 3.9 m. A person listens to these sounds. What is the difference between the two sounds the person hears?

12 identical resistance of resistance R each are arranged in form of a cube. Resistance across it's one of the face diagonal is?

55.Rain is falling vertically with a velocity of 3km/h.A man walks in the rain with velocity of 4km/h.The drops will fall on the man with a velocity of

Why is it advised to tie a luggage on the roof of a bus with a rope?

A pressure sensor measures 44 psi just before the sudden change of 70 psi. The sensor measures 52 psi at a time 4.5 sec after the change. The sensor time constant (in sec) is 37

As per the request of one of his friends from equator, Rahul buys 100 grams of silver at the north pole. He hands it over to his friend at the equator. Will the friend agree with the weight of silver bought? If not, why?

A bunch of feathers and a stone of the same mass are released simultaneously in air. Which will fall faster and why ? How will your observation be different if they are released simultaneously in vacuum ?

Choose the ray diagram which shows the image formation for object placed at center of curvature of concave mirror.

The mass of water displaced by a solid of mass 400 g and volume 150 cm3 is

Question 3(c)State whether the following statement is true or false.Lightning conductor cannot protect a building from lightning.